Group bar charts?

I have an array question created with about 8 different subquestions and 5 options in the array. What I'm trying to figure out is how to do a group bar chart when looking at the results. I see how to do a bar chart, but it does a separate chart for each subquestion. Is there a way to put all subquestions on 1 bar chart?

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member,
professional service on demand
(or search sondages pro).
An error happen ? Before make a new topic : remind the
Debug mode
.